Method for controlling exhaust gases in oxygen blown converter

Abstract

A method for recovering unburnt exhaust gases in an oxygen converter, characterized by the control of an exhaust gas damper by a control signal obtained by signal-processing, in accordance with the set functional formulae, an exhaust gas damper control signal obtained from a pressure differential between throat pressure and atmospheric pressure, and an exhaust gas damper prediction control signal obtained by continuously detecting the quantity of oxygen fed, the quantity of secondary raw material charged, the composition of exhaust gases and the flow rate of exhaust gases to calculate the quantity of furnace generated gases and the quantity of combustion exhaust gases at throat.

What is claimed is: 
     
       1. A method of recovering combustible gases exhausted during the operation of an oxygen blown converter, comprising the steps of: (a) detecting a pressure differential between the hood of the converter and atmospheric pressure, comparing the detected pressure differential with a predetermined safe pressure differential to provide a steady-state exhaust gas damper control signal which maintains said safe pressure differential using the actual generated gases in the converter;   (b) detecting the quantity of oxygen fed to the converter, the quantity of raw material charged to the converter, the composition of the exhaust gases and the flow rate of the exhaust gases to provide a modified exhaust gas damper control signal which maintains said safe pressure differential based upon the expected generated gases in the converter;   (c) selecting said modified exhaust gas damper control signal during ingredient modification to the converter, and selecting said steady-state exhaust gas damper control signal during steady-state operation; and   (d) adjusting the exhaust damper in the converter using the selected control signal, so as to reduce the loss of combustible gases.